(A) because the primary purpose of a thesis statement is to present the essay's topic to the reader, introduce the audience to your position on the subject and provide a guide for the arguments you intend to make to support this belief or idea
It sounds like to me that its talking about the theme or the main idea so it will be about how you will have to stay close to your friends and trust each other.
Bad weather such as thunderstorms wet and cold
The answer to your question is most adequately described with letter D. The theme is the mysteries of God, as this was his "preoccupation." This is implemented in his epic tradition in Europe.
